In some women who havetype
1 diabetes,
the hormonal changes that come with menstruation can cause changes in blood
glucose levels. Monitoring levels and adjusting insulin accordingly is key
to managing this monthly shift.

Two or three days before menstruation, as estrogen and progesterone levels
are changing, a number of women — but not all — will notice that theirinsulin
needs
increase substantially because their blood glucose levels are rising.